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I will synthesize and evaluate, robust highly active mixed protonic /electronic conducting cathode materials for operation at 600 ~ 400 °C, by investigating the synergistic effect of co-doping niobium (Nb5+), tantalum (Ta5+) and/or Zn2+, Sc3+ on the B-site of cation-ordered double perovskite, in an effort to enhance hydrogen incorporation and to create  channels for fast diffusion. 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